to bring those who killed our fellow americans to justice. [ cheers and applause ] >> reporter: the fbi is sending a team from new york to germany, then benghazi, to investigate. libya announced four arrests in the deaths of four americans and said they're looking for more. >> we have to protect our people. we have to protect the americans. >> reporter: secretary of state hillary clinton identified the two security guards who were killed. >> they were good and brave men. they were committed to the cause of building a brighter future for the people of libya. >> reporter: in washington and on the campaign trail, republicans are pushing the obama administration. >> the world needs american leadership. >> no mixed signals. >> reporter: and blamed protests on the arab spring gone bad. >> what this is all about is american weakness and the president's inability to lead. >> reporter: here the fbi is investigating the man who made the film who posted the film that touched off these protests. they say that he was on probation and not supposed to use the internet without permission. mara? >> trac